Photographic lens shutter



March 2'5, 1930. A. AU HIER ,7 ,8

PHOTOGRAPHIC LENS SHUTTER Filed Jan. 30, 1929' whee Patented Mar. 25,1930 UNITED STATES PATENT OFFICE ALFRED GAUTHIER, O1GALMBACH-DN-THE-ENZ, GERMANY PEOTOGRAIHIC' LENS SHUTTER 5 toothed wheelretarding mechanism has been provided with an additional retardingmechanisin capable of being disconnected therefrom, so that for thelonger instantaneous exposures the main and the additional retardmgmechanism jointly and for shorter instano oil/25 of a second but afterit has run down.

taneous exposures one retarding mechanism only isbrought into operativeassociation with the spring actuated driving mechanism of the shutterduring its running down motion. The actuation of the two retardingmechanisms from the spring operated driving mechanism and the regulationfrom the adjusting means is in each instance a joint one and the tworetarding mechanisms thus are in an interdependent relationship, so thatthe effective range of the separate retarding mechanisms cannot begraduated in the degree required for accuratel regulating the shutterspeeds and adapted to the requirements of the spring actuated operatingmechanism. A further disadvantage is that with such an arrangement arelatively complicated operating mechanism is required.

The object of the present invention is to provide a lens shutter inwhich for retarding the speed of the shutter two separate retardingmechanisms are so arranged that they can be brought into engagementseparately and independently of one another. A further feature of theretarding arrangement consists in this that each retarding mechanism isregulated from the adjusting means unaffected by the other retardingmechanism.

The invention as applied to a so-called automatic shutter is shown bywayof example in the accompanying drawing.

Fig. 1 shows a constructional example applied to a lens shutter with theiris d aphragm part removed and the exposed driving mechanismin therun-do'wn'condition of the shutter and set to a slow. speed (1 second).

Fig. 2 shows the shutter set before bemg released and set to 1/25 of asecond.

Fig. 3 also shows the shutter set to a spec of the casmg. a. Accordingto 1929,.Ser1a1 No. 336,191, and in Germany June 4, 1927.

a is the shutter casing which contains arranged in a circle in itsinterior space surrounding the a erture a the usual parts for releasingthe s utter, viz: the piston b, the

cam lever c with the spring d, the pawl e and the spring 7. Pivoted onthe screw 9 is the main operatin lever k which is controlled by thespring 2'. ivoted on the screw m is the toothed segment lever Z which isin engagement with the retarding mechanism 0, p, g, r so and which hasits toothed endl held by means of its spring a against theinside of thewall the invention, besides the retarding mechanism l-r a separateretardin mechanism is provided, 05 which consists o the lever t pivotedon a screw 8 and which also bears teeth on its free end 1 which meshwith the inion a which pinion is connected in a suita le' manner withthe inertia member '0 and is capable of rotating together with .thelatter about the in v Pivoted in the .pin t is a hook z w ich is pressedbymeans of aspring 3 against the pin The shutter operates in thefollowing manmm Through the finger bein pressed on the lever 0 in thedirection of t e arrow, the main operating lever h is rotated by thepawl e pressing against the right-angled projection k on the lever 72.in opposition to the pressure of the spring 2', until the position.shown in Fig. 2 is reached, whereupon the pawl e slides ofi theprojection 72. and releases the lever k. The latter snaps back under thepressure 'ofthe spring i into-its s5 inoperative position, at the sametime opening the shutter blades (not shown 1n the drawing) which, whenthe lever it has reached its inoperative position, return under theaction of a spring into the closed position. When set to a longerperiod-of exposure (1 second to 1/5 of a second, Fig. 1) the retardingmechanism Z,'o, p, g moves into the path of action of the projection inon the yielding pawl la and retards'the motion of the lever h in a knownmanner, when the shutter blades are inythe open position,

in accordance with the adjustment of the lovers by means of the pin mand the scale a. With a retardation of'the shutter of less duration (forinstance when the index lever w is set to 1/25 of a second), theretarding mechanism Z, 0, p, g is removed trom the path of action of thepawl is (Fig. 2). At 5 the same time the pin :19 will have moved intothe position opposite the recess 2 in the hook 2, so that theprojection2 on the hook 2, on the lever It being stressed, engages behind the bentover flat part it of the lever h and during the running down motionimparts motion'to the book 2, the lever t and the retarding mechanism 70,1), by which means the shut- .ter is retarded only for a'shortduration corresponding to the setting of the scale For still higherspeed (1/50 of a second) the hook z is moved by the spring 3 only so farinto the path of motion of h that during the running down motion of thelever h it is carried along by the pro'ection 2 whereby the lever t iscaused tofswmg through only about half the length of the toothed portiont When the shutter is set for still higher speeds, the two retardingmechanisms are both brought out of engagement with the lever h. 5 Theinvention makes it possible accurately to adaptt'he resistance of eachsingle retarding mechanism independently of the other retardingmechanism in accordance with the instantaneous speedsrequiredand thepower of the spring of the operating means of the shutter, although theconstruction of the shutter is very'simple.

What I claim is: 1. A photographic lens shutter comprisng in combinationspring actuated operatmg means, two toothed wheel retarding mechanisms,and means for bringing the said retarding mechanisms separately andindein claim 1, and havin means for regulating the two retarding mecanisms independently of one another, as and for the purpose set forth;

In testimony. whereof I have signed my name to this specification.

ALFRED GAUTHIER.

"pendently into operative association with the said operatin means asand for the u use set forth. g p rp 2. A hotogr'apbic lens shuttercomprising in com mation spring actuated operating means, two toothedwheel retarding mechanlsms capable of oflering a different retardmgresistance, and means for bringing the said retard ng mechanismsseparately and independentlyinto'operative association with the saidoperating means as and for the pur- 5o pose set forth.

3; A photographic lens shutter comprising in combination spring actuatedoperating means, a main operating lever, two toothed wheel retardingmechanisms each capable'of 5 offering a diflerent retarding resistance,the retardingmechanism'offering the smaller resistance being capable ofcoacting directly .wlth the saidmain operating lever, and a yieldmglypivoted lever capable of connectmg the retarding'mechanism offering thegreater resistance to the main operating lever durmg the inoperativereturn motion of the sa d retarding mechanism, as and for the purposeset forth. V V

4. Aphotographie lens shutter as claimed

